Yosta Livepor 256w mod requires triple 18650 cells and can support 10W-256W variable output. You can switch the mod with VW/MECH/TC-Ni/TC-Ti/TC-SS/PTC Mode. And enjoy different vaping experience from them. The PTC function will provide you a excellent vaping experience, user can adjust different output power while vaping. And it also comes with big size fire button and large OLED screen.